Argb Color to Know Color Name

[Samuel L Matzen]

Hi NG,

I have an Argb color stored in a database as a 32 bit integer.

If this color is a KnownColor, is there any way I can get the known color
name so I can display the known color name on the form and in my reports?

The System.DrawingC olor.ToKnowColo r method will not do this for me.

Thanks in advance for any help.

-Sam Matzen

[Peter Huang]

Hi Samuel,

As the document said,
Return Value
An element of the KnownColor enumeration, if the Color structure is created
from a pre-defined color by using either the FromName method or the
FromKnownColor method; otherwise, zero.

Remarks
A pre-defined color is also called a known color and is represented by an
element of the KnownColor enumeration. When the ToKnownColor method is
applied to a Color structure that is created by using the FromArgb method,
the ToKnownColor method returns zero, even if the ARGB value matches the
ARGB value of a pre-defined color. The ToKnownColor method also returns
zero when it is applied to a Color structure that is created by using the
FromName method with an invalid string name.

[link]
http://msdn.microsoft.com/library/de...us/cpref/html/
frlrfSystemDraw ingColorClassTo KnownColorTopic .asp
So I think we can compare the argb value with the knowncolors' to know
which knowncolor matched current color.

Private Sub Button1_Click(B yVal sender As System.Object, ByVal e As
System.EventArg s) Handles Button1.Click
Dim kc As Color = Color.FromKnown Color(KnownColo r.Blue)
Dim cr As Color = Color.FromArgb( kc.ToArgb())
Dim c As KnownColor
For i As Integer = 1 To 137
If Color.FromKnown Color(i).ToArgb () = cr.ToArgb() Then
Debug.WriteLine (CType(i, KnownColor).ToS tring())
End If
Next
End Sub

So you will use the method very frequently, we can build a hashtable with
argb to knowncolor name mapping, so that the performance will be better.

Best regards,

Peter Huang
Microsoft Online Partner Support

Get Secure! - www.microsoft.com/security
This posting is provided "AS IS" with no warranties, and confers no rights.

[rawCoder]

Hi Samuel,

I am afraid I dont know how to solve this problem, but I can tell you why
the ToKnownColor doesnt work. It does this due to the following reason
Return Value
An element of the KnownColor enumeration, if the Color structure is created
from a pre-defined color by using either the FromName method or the
FromKnownColor method; otherwise, zero.

Remarks
A pre-defined color is also called a known color and is represented by an
element of the KnownColor enumeration. When the ToKnownColor method is
applied to a Color structure that is created by using the FromArgb method,
the ToKnownColor method returns zero, even if the ARGB value matches the
ARGB value of a pre-defined color. The ToKnownColor method also returns zero
when it is applied to a Color structure that is created by using the
FromName method with an invalid string name.

got from MSDN
http://msdn.microsoft.com/library/de...colortopic.asp

rawCoder

"Samuel L Matzen" <sm*****@slm.co m> wrote in message
news:%2******** ********@TK2MSF TNGP12.phx.gbl. ..

Hi NG,

I have an Argb color stored in a database as a 32 bit integer.

If this color is a KnownColor, is there any way I can get the known color
name so I can display the known color name on the form and in my reports?

The System.DrawingC olor.ToKnowColo r method will not do this for me.

Thanks in advance for any help.

-Sam Matzen

[rawCoder]

Hi Samuel,

While searchig your problem on newsgroups .. i found a simple (not best)
solution
public bool GetKnownColor(i nt iARGBValue, out string strKnownColor)
{
Color someColor;

Array aListofKnownCol ors = Enum.GetValues( typeof(KnownCol or));
foreach (KnownColor eKnownColor in aListofKnownCol ors)
{
someColor = Color.FromKnown Color(eKnownCol or);
if (iARGBValue == someColor.ToArg b() && !someColor.IsSy stemColor)
{
strKnownColor = someColor.Name;
return true;
}
}
strKnownColor = "";
return false;
}
Thanx to Robert Hachtel (ro***********@ panoramicsci.co m) on
microsoft.publi c.dotnet.framew ork.drawing who posted this on 2002-02-20
11:49:37 PST in response to How can find if a given ARGB value is a known
color?

btw .. the hashtable thing that Peter Huang recommended is the ideal thing.

I hope u will take time to convert it to VB ... and that wont be much of a
problem ...

Thank You,
rawCoder


"Samuel L Matzen" <sm*****@slm.co m> wrote in message
news:%2******** ********@TK2MSF TNGP12.phx.gbl. ..

Hi NG,

I have an Argb color stored in a database as a 32 bit integer.

If this color is a KnownColor, is there any way I can get the known color
name so I can display the known color name on the form and in my reports?

The System.DrawingC olor.ToKnowColo r method will not do this for me.

Thanks in advance for any help.

-Sam Matzen

[Samuel L Matzen]

Peter,

Thanks, that is what I was looking for.

-Sam Matzen
""Peter Huang"" <v-******@online.m icrosoft.com> wrote in message
news:JJ******** ******@cpmsftng xa10.phx.gbl...

Hi Samuel,

As the document said,
Return Value
An element of the KnownColor enumeration, if the Color structure is created from a pre-defined color by using either the FromName method or the
FromKnownColor method; otherwise, zero.

Remarks
A pre-defined color is also called a known color and is represented by an
element of the KnownColor enumeration. When the ToKnownColor method is
applied to a Color structure that is created by using the FromArgb method,
the ToKnownColor method returns zero, even if the ARGB value matches the
ARGB value of a pre-defined color. The ToKnownColor method also returns
zero when it is applied to a Color structure that is created by using the
FromName method with an invalid string name.

[link]
http://msdn.microsoft.com/library/de...us/cpref/html/ frlrfSystemDraw ingColorClassTo KnownColorTopic .asp
So I think we can compare the argb value with the knowncolors' to know
which knowncolor matched current color.

Private Sub Button1_Click(B yVal sender As System.Object, ByVal e As
System.EventArg s) Handles Button1.Click
Dim kc As Color = Color.FromKnown Color(KnownColo r.Blue)
Dim cr As Color = Color.FromArgb( kc.ToArgb())
Dim c As KnownColor
For i As Integer = 1 To 137
If Color.FromKnown Color(i).ToArgb () = cr.ToArgb() Then
Debug.WriteLine (CType(i, KnownColor).ToS tring())
End If
Next
End Sub

So you will use the method very frequently, we can build a hashtable with
argb to knowncolor name mapping, so that the performance will be better.

Best regards,

Peter Huang
Microsoft Online Partner Support

Get Secure! - www.microsoft.com/security
This posting is provided "AS IS" with no warranties, and confers no rights.

[Samuel L Matzen]

rawCoder,

Thanks for the research, that is what I was looking for.

-Sam Matzen
"rawCoder" <ra******@hotma il.com> wrote in message
news:uJ******** ******@tk2msftn gp13.phx.gbl...

Hi Samuel,

While searchig your problem on newsgroups .. i found a simple (not best)
solution
public bool GetKnownColor(i nt iARGBValue, out string strKnownColor)
{
Color someColor;

Array aListofKnownCol ors = Enum.GetValues( typeof(KnownCol or));
foreach (KnownColor eKnownColor in aListofKnownCol ors)
{
someColor = Color.FromKnown Color(eKnownCol or);
if (iARGBValue == someColor.ToArg b() && !someColor.IsSy stemColor)
{
strKnownColor = someColor.Name;
return true;
}
}
strKnownColor = "";
return false;
}
Thanx to Robert Hachtel (ro***********@ panoramicsci.co m) on
microsoft.publi c.dotnet.framew ork.drawing who posted this on 2002-02-20
11:49:37 PST in response to How can find if a given ARGB value is a known
color?

btw .. the hashtable thing that Peter Huang recommended is the ideal thing.
I hope u will take time to convert it to VB ... and that wont be much of a
problem ...

Thank You,
rawCoder


"Samuel L Matzen" <sm*****@slm.co m> wrote in message
news:%2******** ********@TK2MSF TNGP12.phx.gbl. ..

Hi NG,

I have an Argb color stored in a database as a 32 bit integer.

If this color is a KnownColor, is there any way I can get the known color name so I can display the known color name on the form and in my reports?
The System.DrawingC olor.ToKnowColo r method will not do this for me.

Thanks in advance for any help.

-Sam Matzen